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Debt and Interest Expense - Scheduled Maturities Table (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 928
2020 0
2021 1,177
2022 670
2023 220
Western Gas Partners LP [Member]  
Debt Instrument [Line Items]  
2019 0
2020 0
2021 500
2022 670
2023 220
Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
2019 28 [1]
2020 0 [1]
2021 0 [1]
2022 0 [1]
2023 0 [1]
Anadarko Excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
2019 900 [2]
2020 0 [2]
2021 677 [2]
2022 0 [2]
2023 $ 0 [2]
[1] Excludes WES.
[2] Excludes WES and WGP